Battery light on, new alternator new battery?

Yep, jumping a car backwards can hurt the electronics. We should be able to do a CAN scan to confirm the issue, you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon here is a video to show you how. The PCM controls the alternator so it could be bad, but we should run the codes.

https://youtu.be/u-4syLc-ifQ


and

https://www.2carpros.com/articles/resolving-reverse-battery-connection-in-cars-a-step-by-step-repair-guide


Here are the wiring diagrams for the charging system. You can see there is not too much to it. Here is how to change the PCM out in case a code comes up for it, you can get a preprogrammed unit by searching Google or Ebay.

Thanks for that Ken. I'm using a d7 xtool scanner. Is that different to a can scanned? Only code I get is in the pic I've sent. When I clear this code. battery light goes off demister light comes on but after 10 seconds it comes back on again and demister light goes off. Generator is charging at 13.85..and 13.70 under load..ie lights fan radio.

Yep, that is internal to the PCM, so it looks like the PCM is bad. I would remove it and send it in for testing.

Okay, thanks Ken. will do. Can a junkyard PCM fix the problem? Can I programmed it myself with the xtool scanner or does it need a Ford dealer to do it?

You should be able to program it with your scanner because it is bidirectional. If not, you can send it in for programming, just have your VIN number ready.

Okay, thank you so much for your help Ken.

You are welcome, please let me know what happens.

Will do. it might be a while before I get round to it. Thanks again

Hi,

I noticed we haven't been in contact with you for a couple of days. Have you been able to make any progress? Is there anything I can do to help?

Let me know.

Take care,

Joe

It'll be a few months before I get round to if. Due to work commitments. Thanks again for your help.

Hi,

No problem whatsoever. We'll be here.

Take care of yourself,

Joe

Thanks joe.